Structural optimization design method of compression type piezoelectric accelerometer

Abstract

The invention relates to the field of piezoelectric accelerometers, and discloses a structural optimization design method of a compression type piezoelectric accelerometer. According to the method, firstly, the mass of the piezoelectric accelerometer serves as a design target, inherent frequency and voltage sensitivity serve as constraints, design variables are selected on the basis of sensitivityanalysis, and therefore an accelerometer structure optimization model is constructed, and a preliminary solution is obtained through solving; secondly, considering uncertainty related to structural dimensions and material parameters in engineering, measuring the comprehensive influence of the uncertainty on the performance on the basis of an interval analysis technology, and improving an optimization model on the basis to obtain a reliable design result; according to the method, on the premise that the performance reliability of the accelerometer in the aspects of inherent frequency, voltagesensitivity and the like is guaranteed, the structural mass is effectively reduced, and a potential design tool is provided for optimization of the high-performance and high-reliability compression type piezoelectric accelerometer; in addition, the method is simple in principle, easy and convenient to operate and good in engineering practicability.

Description

technical field [0001] The invention relates to the field of piezoelectric accelerometers, in particular to a structural optimization design method suitable for compressive piezoelectric accelerometers. Background technique [0002] The compression piezoelectric accelerometer has the characteristics of fast response, wide frequency range, good linearity, and high sensitivity, so it is widely used in vibration test calibration, mechanical dynamic test, modal analysis, fault important aspects of diagnosis. Typically important considerations in the design of an accelerometer include: mass, natural frequency, and sensitivity. The smaller the self-weight of the accelerometer, the smaller the additional mass load introduced to the system under test, the smaller the impact on the measurement accuracy and it is easy to install. In design specifications, 1 / 3 of the first-order natural frequency of the accelerometer is usually selected as the maximum range of the product; in other w...

AI Technical Summary

Problems solved by technology

First of all, the structural size can be designed and has a significant impact on performance, and the dimensions are high and related to each other. Trial calculations one by one and verification through experiments will lead to unbearable design costs

Although numerical simulation techniques such as finite element analysis have been introduced into the design process of accelerometers, the design cost has been greatly reduced compared with real experiments; but the design method based on trial calculation strategy is still difficult to meet the needs of actual engineering

Secondly, in engineering practice, there are unavoidable uncertainties in the structural dimensions and material parameters of each component in the accelerometer. The combined influence of these uncertainties may lead to the failure of the accelerometer in terms of key performance.

Although some stochastic optimization algorithms for uncertain structures have been developed in the theoretical field, there are obstacles in engineering applications due to their profound theories and cumbersome processes.

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